Dieback of Gmelina arborea Trees and Structural Alterations Induced in the Wood Cell Walls by Alternaria alternata

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Sivan, Pramod,1984-KTH,Albanova VinnExcellence Center for Protein Technology, ProNova,Glykovetenskap (författare)

Dieback of Gmelina arborea Trees and Structural Alterations Induced in the Wood Cell Walls by Alternaria alternata

Artikel/kapitelEngelska2022

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2021-12-23
AVES YAYINCILIK A.Ş.2022
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LIBRIS-ID:oai:DiVA.org:kth-307556
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-307556URI
https://doi.org/10.5152/forestist.2020.21023DOI

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Språk:engelska
Sammanfattning på:engelska

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QC 20230912
The death and structural alterations in the secondary xylem of Gmelina arborea trees in response to fungal invasion were investigated by light and electron microscopy methods. In vivo experiments indicate that Alternaria alternata is an aggressive pathogen which invades the deeper part of the wood in the branches-up to 4 cm from the site of infection--within 10 days of inoculation. The mycelial invasion occurred through pits and boreholes formed by the fungus in the vessels, fibers, and axial and ray parenchyma cells. Scanning electron microscopy also revealed the colonization of fungus through pit and vessel elements. In vitro studies showed that ray cells and fibers were more prone to cell wall damage in contrast to vessels during the initial stage of infection. The etiology of infection found in the infected samples collected from the living trees and samples of in vivo and in vitro experiments showed similar patterns of infection and confirmed that A. alternata is responsible for the mortality and decay in Gmelina trees. It causes a typical soft-rot pattern with cell wall alterations such as cavity formation by "L" bending. The separation of fibers at the compound middle lamella region indicated that the fungus is capable of degrading both lignin-rich regions of cell walls. The boreholes in the fiber wall also showed distinct variations in size and shape. The penetration of fungal hyphae through the middle lamella and removal of lignin from the cell walls was also confirmed with transmission electron microscopy studies.

Ämnesord och genrebeteckningar

LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Trävetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Wood Science hsv//eng
Dieback
fungi
infection
soft rot
wood decay

Biuppslag (personer, institutioner, konferenser, titlar ...)

Mesara, SureshSardar Patel Univ, Dept Biosci, Vallabh Vidyanagar, Gujarat, India. (författare)
Rao, Karumanchi S.Sardar Patel Univ, Dept Biosci, Vallabh Vidyanagar, Gujarat, India. (författare)
Rajput, Kishore S.Maharaja Sayajirao Univ Baroda, Fac Sci, Dept Bot, Vadodara, India. (författare)
KTHAlbanova VinnExcellence Center for Protein Technology, ProNova (creator_code:org_t)

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Ingår i:FORESTIST: AVES YAYINCILIK A.Ş.72:1, s. 2-92602-4039

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Av författaren/redakt...: Sivan, Pramod, 1 ...; Mesara, Suresh; Rao, Karumanchi ...; Rajput, Kishore ...

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Av lärosätet: Kungliga Tekniska Högskolan

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